Malicious PDF — malware analysis report

Static analysis result for SHA-256 77170c0c9c560e84…

MALICIOUS

PDF

52.6 KB Created: 2020-09-01 11:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3f23d897678c4ffe761a27f82b2e8d09 SHA-1: 01693823366fa61d09dd443b0b5bef0d7e0a3a4a SHA-256: 77170c0c9c560e84508e6857a816849375ac4eb56e3ce95a18d1002b5204330d
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly flagged this PDF. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'Bloons tower defence 5 mac free', likely a phishing attempt to trick users into downloading malware. The presence of embedded URLs and a 'download button' heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wix?keyword=bloons+tower+defence+5++mac+free In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/21e6f2_3201e0f43bb94c84bc118da6f011753e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ca9b0a_b00ca048655d4c2f9ee7930135da0853.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0cd3a8_72c357bdf4fb4f9cb41d1a902a925170.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b7306e_004383c709ff41419ec7f79b6a5c967d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9ff9b8_4fbeabdbfdce45ffaf090db4200317f9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6203b9_426d5147afbd4a259e1285a6e378e629.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cb5dea_bc99eaf5932645ec89408399a9d34e4c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9dda13_fd50efd0477f44b0951cf48a04d557be.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6a22cb_e22e09a485534113b86b3114b4373a3c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/42365155427.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/edit_converted_to_word_document.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4077/6090/files/gezilipesixijeguwux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2465/4241/files/46773381907.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/xibixibezibajomove.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/callan_method_teacher_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/flowers_for_algernon_complete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0954/8188/files/tolefeninikovebedape.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC0 5172 bytes
SHA-256: eea1bdcbd040fb84a3316ee2169026de470c39ae1e2e17dfed9f31d3f8ea2216
font_01_sfnt_off00007d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D51 10664 bytes
SHA-256: 3d19186706d5f9b4777eb8f0cd7f6a9ab30296fd297c35edad8b3a932b51540e
font_02_sfnt_off0000a20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA20A 16096 bytes
SHA-256: 2fa4f296fe9e38b1bea2264e65e06c45fbbf4edfcb32b68fd436b1108ab95b01
font_03_sfnt_off0000b6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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